JPH048207B2 - - Google Patents

Info

Publication number
JPH048207B2
JPH048207B2 JP58192401A JP19240183A JPH048207B2 JP H048207 B2 JPH048207 B2 JP H048207B2 JP 58192401 A JP58192401 A JP 58192401A JP 19240183 A JP19240183 A JP 19240183A JP H048207 B2 JPH048207 B2 JP H048207B2
Authority
JP
Japan
Prior art keywords
mold
injection molding
reaction
reaction injection
diazabicyclo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP58192401A
Other languages
Japanese (ja)
Other versions
JPS6083820A (en
Inventor
Kenichi Waratani
Masao Goto
Makoto Iida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP58192401A priority Critical patent/JPS6083820A/en
Publication of JPS6083820A publication Critical patent/JPS6083820A/en
Publication of JPH048207B2 publication Critical patent/JPH048207B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/10—Applying counter-pressure during expanding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/585—Moulds with adjustable size of the mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/043—Skinned foam

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

本発明は、反応射出成形方法に係り、特に材料
の反応硬化の初期の段階で、型で材料を圧縮し、
これにより成形品の強度向上を志向した反応射出
成形方法に関するものである。 〔発明の背景〕 従来の反応射出成形方法は、混合液を型内に注
入し、型内で反応硬化させて成形品を得る方法で
あつた。成形品の強度向上をはかるためには、材
料の注入量を多くして成形品を高密度にする必要
があつた。一方低密度成形品の強度向上をはかる
方法としては、型温度を低くして成形品のスキン
層（表層部）密度を高くしまた厚さを厚くする方
法があるが、これだけでは十分な密度と厚さが得
られず、また、この方法では、材料の流動性が阻
害されるなどの問題があつた。 〔発明の目的〕 本発明は、上記した従来技術の欠点を除去し、
材料を型内に注入後、材料の反応硬化初期の段階
で同一型により材料を圧縮し、成形品の強度向上
をはかつた反応射出成形方法の提供をその目的と
するものである。 〔発明の概要〕 本発明による反応射出成形方法は、材料を型内
に注入後、材料の反応硬化する初期の段階で、同
一型で材料を圧縮し、成形品の組織を緻密化する
と同時に圧縮応力を付与して得られた成形品の強
度向上をはかることである。すなわち、材料の反
応硬化の初期の段階では、軟質でありまたスキン
層も形成されていない。このときに材料を型で圧
縮すると、反応または発泡圧力による材料の膨脹
が抑止され、これによつて得られた成形品の組織
が緻密になりまた圧縮応力が付与される。これは
成形品の強度向上の点で有効である。 〔発明の実施例〕 以下、本発明の一実施例を第１図〜第８図によ
り説明する。第１図及び第２図は、本発明による
平板成形品を反応射出成形している状態を示す型
の断面図である。第３図および第４図は、本発明
による曲面を有する板状の成形品を反応射出成形
している状態を示す型の断面図である。第５図は
第１図及び第２図で成形した反応射出成形品の断
面図である。また、第６図は第３図及び第４図で
成形した反応射出成形品の断面図である。第７図
は、ポリウレタン樹脂材料の反応硬化過程におけ
るスキン層の圧壊強さの変化を示したものであ
る。サンドイツチ構造状の発泡構造体が得られる
ポリウレタンの反応射出成形（Ｒeaction Ｉ
njection Ｍolding：以下RIMと略称）の原理
は、まず原液A1と原液B2をミキシングヘツド
（図示せず）内で高速で衝突混合し、40〜80℃に
保持された上型１と下型２で構成される型のキヤ
ビテイ内に射出すると化学反応により自己発熱
し、原液Ａの中に含まれる発泡剤のフレオンが気
化し発泡体が形成される。その際型壁面に接する
部分では型温が低い（40〜80℃）ため、いつたん
気化したフレオンが再び凝縮されるため高密度の
スキン層が形成される。 次に本発明で使用する材料について説明する。
Ａ液はポリオール、整泡剤、発泡剤、触媒からな
り、Ｂ液はボリイソシアネートからなる。ところ
でポリオールは以下(a)〜(c)の三種類の化合物を混
合する。 (a) 脂肪族アミン系ポリオール この化合物は、脂肪族アミンと適量のアルキ
レンオキシドとを塩基性触媒存在下に付加反応
させて得たものであり、モノエタノールアミ
ン、トリエタノールアミン、エチレンジアミ
ン、トリエチレンテトラミン、アンモニア、ヘ
キサメチレンジアミン、ジエチレントリアミン
などにエチレンオキシド、プロピレンオキシ
ド、プチレンオキシド、エピクロルヒドリンな
ど付加させたものである。付加反応で得た化合
物は一種類もしくは二種類以上混合して用い
る。即ちOH価450〜800KOHmg／ｇで１分子
内に３〜４個のOH基を有するこの化合物はフ
レオンなどの発泡剤との相溶性が良好である。 (b) 芳香族アミン系ポリオール ４，4′−ジアミノジフエニルメタンのアルキ
レンオキシド付加物でOH価280〜600KOH
mg／ｇのものを用いる。この化合物は、成形品
の機械強度を向上させる作用を有する。 (c) 一般のポリオール グリセリン、トリメチロールプロパンジグリ
セリン、シヨ糖、エチレングリコール、水、プ
ロピレングリール、ビスフエノールＡ、ビスフ
エノールＦ等の１分子内に２〜３個の活性水素
を有した化合物のアルキレンオキシド付加物が
ある。即ちOH価30〜100KOHmg／ｇの１分子
内に２〜３個の水酸基を有するポリオール。 上記化合物は、成形品に伸びを持たせるのに
有効である。上記(b)の化合物と、上記(c)の化合
物とで成形品に強度と耐衝撃性を賦与する。 上記化合物(a)〜(c)の配合割合は、化合物(a)20
〜60wt％、化合物(b)30〜60wt％、化合物(c)10
〜40wt％である。配合割合が上記範囲外にな
ると成形品として必要な特性が得られない。 即ち化合物(a)が20wt％以下になるとフレオ
ンとの相溶性が悪くなつて液が分離し、構造体
を成形する際問題となる。また化合物(a)が
60wt％以上になると上記構造体として強度が
不足する。化合物(b)が30wt％以下になると上
記構造体として強度が不足する。また化合物(b)
が60wt％以上になるとフレオンとの相溶性が
悪くなつて上記構造体を成形する際問題とな
る。化合物(c)が15wt％以下になると伸びが小
となりもろくなり全体として上記構造体の強度
不足となる。また化合物(c)が40wt％以上にな
ると弾性率が小となり、靭性がなくなり、全体
として上記構造体の強度不足となる。 (d) 整泡剤 アルキレンオキシド変成ポリジメチルシロキ
サン、フツ素表面活性剤がある。これら化合物
は単独もしくは混合して使用する。配合割合
は、全ポリオール成分100重量部に対して１〜
５重量部である。 (e) 発泡剤 H2Oや、トリクロロモノフルオロメタン、
ジクロロジフルオロメタン、メチレンクロライ
ド、トリクロロトリフルオロエタン、テトラク
ロロジフルオロエタンの如き低沸点の有機液状
化合物を用いる。これらは単独もしくは混合し
て使用する。配合割合は、全ポリオール成分
100重量部に対して５〜45重量部である。 (f) 触媒 ジアザ−ビシクロ−アルケン類、例えば１，
４−ジアザビシクロ〔２，２，２〕オクタン
（トリエチレンジアミン）、１，８−ジアザビシ
クロ〔５，４，０〕−ウンデカン−７（DBU）、
1.5−ジアザビシクロ〔４，２，０〕オクテン
−５、１，８−ザアザビシクロ〔７，２，０〕
ウンデセン−８、１，４−ジアザビシクロ
〔３，３，０〕オクテン−４、３−メチル−１，
４−ジアザビシクロ〔３，３，０〕オクテン−
４、３，６，７，７−テトラメチル−１，４−
ジアザビシクロ〔３，３，０〕オクテン−４、
７，８，８−トリメチル−１，５−ジアザビシ
クロ〔４，３，０〕ノネン−５、１，８−ジア
ザビシクロ〔７，３，０〕ドデセン８、１，７
−ジアザビシクロ〔４，３，０〕ノネン−６、
１，７−ジアザビシクロ−〔４，４，０〕デセ
ン−５、１，８−ジアザビシクロ〔７，４，
０〕トリデセン−８、１，８−ジアザビシクロ
〔５，３，０〕デセン−７、９−メチル−１，
８−ジアザビシクロ〔５，３，０〕デセン−
７、１，６−ジアザビシクロ〔５，５，０〕ト
リデセン−６、１，７−ジアザビシクロ〔６，
５，０〕トリデセン−７、１，８−ジアザビシ
クロ〔７，５，０〕テトラデセン−８、１，10
−ジアザビシクロ〔７，３，０〕ドデセン−
９、１，10−ジアザビシクロ〔７，４，０〕ト
リデセン−９、１，14−ジアザビシクロ〔11，
３，０〕ヘキサデセン−13、１，14−ジアザビ
シクロ〔11，４，０〕ヘブタデセン−13。 アミン類例えばトリエチレンジアミン、ジメ
チルエタノールアミン、モルホリン、ペピリジ
ン。これらのアミン酸は、酸と反応させて塩と
して用いる。 なお、上記化合物は単独もしくは二種類以上
混合して用いる。配合割合は全ポリオール成分
100重量部に対して0.2〜10重量部である。具体
的には第１表に示す組成を用いた。 (g) ポリイソシアネート ４，4′−ジフエニルメタンジイソシアネート
（クルードMDI）、ポリフエニレンポリメチル
イソシアネート、カルボジミイドMDIを用い
る。これら化合物は単独もしくは混合して使用
する。 ポリイソシアネート(d)と、ポリオール(a)〜(c)
の混合物の配合割合は、イソシアネートインデ
ツクス（イソシアネート化合物中に含まれる
NCO基の数とポリオール中に含まれるOHの数
の比）で0.95〜1.30／１である。耐熱性の点で
ポリオール100重量％に対し110〜190重量％が
よい。 その他本発明に使用できる素材としては、整泡
剤（たとえばアルキレンオキシド変成ポリジメチ
ルシロキサン、弗素化合物）、充填材（有機質や
無機質のせんい、粉末粒状物）、顔料、染料、離
燃化剤、酸化防止剤等があり、これらをポリオー
ル中またはポリイソシアネート中に配合して使用
し得ることが確かめられた。 The present invention relates to a reaction injection molding method, particularly in the early stage of reaction curing of the material, compressing the material with a mold,
This invention relates to a reaction injection molding method aimed at improving the strength of molded products. [Background of the Invention] A conventional reaction injection molding method is a method in which a mixed liquid is injected into a mold and reacted and cured in the mold to obtain a molded article. In order to improve the strength of molded products, it was necessary to increase the amount of material injected to make the molded products denser. On the other hand, one way to improve the strength of low-density molded products is to lower the mold temperature to increase the density and thickness of the skin layer (surface layer) of the molded product, but this alone is insufficient to achieve sufficient density. In addition, this method had problems such as impeding the fluidity of the material. [Object of the invention] The present invention eliminates the drawbacks of the prior art described above, and
The object of the present invention is to provide a reaction injection molding method in which the material is injected into a mold and then compressed by the same mold at the initial stage of reaction hardening of the material, thereby improving the strength of the molded product. [Summary of the Invention] The reaction injection molding method according to the present invention compresses the material in the same mold at the initial stage of reaction hardening of the material after injecting the material into the mold, densifies the structure of the molded product, and simultaneously compresses the material. The aim is to improve the strength of molded products obtained by applying stress. That is, at the initial stage of reaction hardening of the material, the material is soft and no skin layer is formed. At this time, when the material is compressed with a mold, expansion of the material due to reaction or foaming pressure is suppressed, thereby making the structure of the obtained molded article dense and applying compressive stress. This is effective in improving the strength of the molded product. [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. 1 and 2 are cross-sectional views of a mold showing a state in which a plate molded product according to the present invention is subjected to reaction injection molding. 3 and 4 are cross-sectional views of a mold showing a state in which a plate-shaped molded product having a curved surface according to the present invention is subjected to reaction injection molding. FIG. 5 is a sectional view of the reaction injection molded product molded in FIGS. 1 and 2. Moreover, FIG. 6 is a sectional view of the reaction injection molded product molded in FIGS. 3 and 4. FIG. 7 shows the change in crushing strength of the skin layer during the reaction curing process of the polyurethane resin material. Reaction injection molding of polyurethane to obtain a foamed structure with a sandwich structure
The principle of injection molding (hereinafter abbreviated as RIM) is that stock solutions A1 and B2 are first collided and mixed at high speed in a mixing head (not shown), and then the upper mold 1 and lower mold 2 maintained at 40 to 80°C are mixed. When injected into the cavity of a mold made of A, self-heating occurs due to a chemical reaction, and the foaming agent Freon contained in the stock solution A is vaporized to form a foam. At this time, since the mold temperature is low (40 to 80°C) in contact with the mold wall, the Freon that has been vaporized is condensed again, forming a high-density skin layer. Next, materials used in the present invention will be explained.
The A liquid consists of a polyol, a foam stabilizer, a blowing agent, and a catalyst, and the B liquid consists of a polyisocyanate. By the way, polyol is a mixture of the following three types of compounds (a) to (c). (a) Aliphatic amine polyol This compound is obtained by addition reaction of an aliphatic amine and an appropriate amount of alkylene oxide in the presence of a basic catalyst. It is made by adding ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin, etc. to tetramine, ammonia, hexamethylene diamine, diethylene triamine, etc. The compounds obtained by the addition reaction may be used alone or in combination of two or more. That is, this compound having an OH value of 450 to 800 KOH mg/g and 3 to 4 OH groups in one molecule has good compatibility with blowing agents such as Freon. (b) Aromatic amine polyol Alkylene oxide adduct of 4,4'-diaminodiphenylmethane with OH value 280-600KOH
Use mg/g. This compound has the effect of improving the mechanical strength of the molded article. (c) General polyols Compounds with 2 to 3 active hydrogens in one molecule such as glycerin, trimethylolpropane diglycerin, sucrose, ethylene glycol, water, propylene glycol, bisphenol A, bisphenol F, etc. There are alkylene oxide adducts. That is, a polyol having an OH value of 30 to 100 KOH mg/g and 2 to 3 hydroxyl groups in one molecule. The above compounds are effective in imparting elongation to molded products. The compound (b) above and the compound (c) above impart strength and impact resistance to the molded article. The blending ratio of the above compounds (a) to (c) is 20% of compound (a)
~60wt%, compound (b) 30-60wt%, compound (c) 10
~40wt%. If the blending ratio is outside the above range, the properties necessary for the molded product will not be obtained. That is, when the amount of compound (a) is less than 20 wt%, the compatibility with Freon becomes poor and the liquid separates, causing problems when molding a structure. Also, compound (a)
If it exceeds 60wt%, the strength of the above structure will be insufficient. If the amount of compound (b) is less than 30 wt%, the above structure will lack strength. Also compound (b)
When the amount exceeds 60 wt%, the compatibility with Freon deteriorates, causing problems when molding the above structure. If the amount of compound (c) is less than 15 wt%, the elongation becomes small and brittle, resulting in the overall strength of the structure being insufficient. Furthermore, when the amount of compound (c) exceeds 40 wt%, the elastic modulus becomes small, the toughness is lost, and the strength of the structure as a whole becomes insufficient. (d) Foam stabilizer Alkylene oxide modified polydimethylsiloxane and fluorine surfactant. These compounds may be used alone or in combination. The blending ratio is 1 to 100 parts by weight of all polyol components.
It is 5 parts by weight. (e) Blowing agents H 2 O, trichloromonofluoromethane,
An organic liquid compound with a low boiling point such as dichlorodifluoromethane, methylene chloride, trichlorotrifluoroethane, or tetrachlorodifluoroethane is used. These may be used alone or in combination. The blending ratio is all polyol components
The amount is 5 to 45 parts by weight per 100 parts by weight. (f) Catalyst diaza-bicyclo-alkenes, such as 1,
4-diazabicyclo[2,2,2]octane (triethylenediamine), 1,8-diazabicyclo[5,4,0]-undecane-7 (DBU),
1.5-diazabicyclo[4,2,0]octene-5,1,8-zaazabicyclo[7,2,0]
undecene-8, 1,4-diazabicyclo[3,3,0]octene-4,3-methyl-1,
4-Diazabicyclo[3,3,0]octene-
4,3,6,7,7-tetramethyl-1,4-
diazabicyclo[3,3,0]octene-4,
7,8,8-trimethyl-1,5-diazabicyclo[4,3,0]nonene-5,1,8-diazabicyclo[7,3,0]dodecene 8,1,7
-diazabicyclo[4,3,0]nonene-6,
1,7-diazabicyclo-[4,4,0]decene-5,1,8-diazabicyclo[7,4,
0] tridecene-8, 1,8-diazabicyclo[5,3,0]decene-7,9-methyl-1,
8-diazabicyclo[5,3,0]decene-
7,1,6-diazabicyclo[5,5,0]tridecene-6,1,7-diazabicyclo[6,
5,0]tridecene-7,1,8-diazabicyclo[7,5,0]tetradecene-8,1,10
-Diazabicyclo[7,3,0]dodecene-
9,1,10-diazabicyclo[7,4,0]tridecene-9,1,14-diazabicyclo[11,
3,0]hexadecene-13, 1,14-diazabicyclo[11,4,0]hebutadecene-13. Amines such as triethylenediamine, dimethylethanolamine, morpholine, pepyridine. These amino acids are used as salts by reacting with acids. The above compounds may be used alone or in combination of two or more. The blending ratio is all polyol components
The amount is 0.2 to 10 parts by weight per 100 parts by weight. Specifically, the composition shown in Table 1 was used. (g) Polyisocyanate 4,4'-diphenylmethane diisocyanate (crude MDI), polyphenylene polymethyl isocyanate, and carbodimide MDI are used. These compounds may be used alone or in combination. Polyisocyanate (d) and polyols (a) to (c)
The blending ratio of the mixture is determined by the isocyanate index (contained in the isocyanate compound).
The ratio of the number of NCO groups to the number of OH contained in the polyol is 0.95 to 1.30/1. In terms of heat resistance, it is preferably 110 to 190% by weight based on 100% by weight of the polyol. Other materials that can be used in the present invention include foam stabilizers (for example, alkylene oxide-modified polydimethylsiloxane, fluorine compounds), fillers (organic or inorganic fibers, powder granules), pigments, dyes, flame retarding agents, oxidants, etc. It has been confirmed that there are inhibitors and the like, and that these can be used by blending them into polyols or polyisocyanates.

【表】【table】

〔発明の効果〕〔Effect of the invention〕

以上、詳細に説明したように本発明によれば、
材料を型内に注入後、反応硬化の初期の段階で同
一型で材料を圧縮し、これによつて材料の組織を
緻密化しまた材料に圧縮応力を付与できるので、
曲げ強さなど引張り力をともなう強度を向上する
ことができる。一例として本発明により平板状の
成形品厚さ10mmを５mmに圧縮した場合と従来方法
で成形した板厚５mmの成形品の曲げ強さを第８図
に示す。 例えば、密度0.5ｇ／cm3のときの曲げ強さは、
従来方法で300Kg／cm2、本発明の方法で450Kg／cm2
である。これは50％の強度向上である。 As described above in detail, according to the present invention,
After injecting the material into the mold, the material is compressed in the same mold during the initial stage of reaction hardening, which densifies the structure of the material and applies compressive stress to the material.
Strength that involves tensile force such as bending strength can be improved. As an example, FIG. 8 shows the bending strength of a 10 mm thick flat plate molded product compressed to 5 mm according to the present invention and a 5 mm thick molded product molded by the conventional method. For example, the bending strength when the density is 0.5g/ cm3 is
300Kg/cm 2 with the conventional method, 450Kg/cm 2 with the method of the present invention
It is. This is a 50% strength increase.

【図面の簡単な説明】[Brief explanation of drawings]

第１図及び第２図は、平板成形品を反応射出成
形する型の断面図、第３図及び第４図は、曲面を
有する板状の成形品を反応射出成形する型の断面
図、第５図は、平板成形品の断面図、第６図は、
曲面を有する板状の成形品の断面図、第７図は材
料が型内に注入された後の反応硬化の過程をスキ
ン層の圧壊強さで表わしたグラフ、第８図は密度
と曲げ強さとの関係を示すグラフ、第９図ａ，ｂ
は圧縮前後の材料の組織を示した図、第１０図は
圧縮によるセル径の変化と単位面積当りのセル個
数を示した図である。 １……上型、２……下型、３……上可動板、４
……下可動盤、５，６……油圧シリンダー、７，
９……ガイドピン、８，１０……コイルばね、１
１……上型取付け板、１２……下型取付け板、１
３……ストツパー、１５，１６……平板成形品、
１７……穴付き上型、１８……穴付き下型、１９
……上可動盤、２０……下可動盤、２１，２２…
…曲面を有する成形品、２３，２４……曲面を有
するバー。 1 and 2 are cross-sectional views of a mold for reaction injection molding a flat molded product, and FIGS. 3 and 4 are cross-sectional views of a mold for reaction injection molding a plate-shaped molded product with a curved surface. Figure 5 is a cross-sectional view of a flat plate molded product, and Figure 6 is a cross-sectional view of a flat plate molded product.
A cross-sectional view of a plate-shaped molded product with a curved surface. Figure 7 is a graph showing the reaction hardening process after the material is injected into the mold in terms of the crushing strength of the skin layer. Figure 8 is a graph showing the density and bending strength. Graph showing the relationship between
10 is a diagram showing the structure of the material before and after compression, and FIG. 10 is a diagram showing the change in cell diameter due to compression and the number of cells per unit area. 1... Upper mold, 2... Lower mold, 3... Upper movable plate, 4
...Lower movable plate, 5, 6...Hydraulic cylinder, 7,
9... Guide pin, 8, 10... Coil spring, 1
1...Upper mold mounting plate, 12...Lower mold mounting plate, 1
3... Stopper, 15, 16... Flat plate molded product,
17... Upper mold with holes, 18... Lower mold with holes, 19
...Upper movable plate, 20...Lower movable plate, 21, 22...
...Molded product having a curved surface, 23, 24... Bar having a curved surface.

Claims (1)

【特許請求の範囲】 １ 型内に注入された材料の反応硬化する初期の
段階で同一型で材料を圧縮し、材料組織を緻密化
するとともに圧縮応力を付与することを特徴とす
る反応射出成形方法。 ２ 材料を圧縮する型は平板状で、上平板及び下
平板で同時に材料を圧縮することを特徴とする特
許請求の範囲第１項記載の反応射出成形方法。 ３ 材料の圧縮する型の材料接触面は曲面であ
り、曲面をもつた上型及び下型で同時に材料を圧
縮することを特徴とする特許請求の範囲第１項記
載の反応射出成形方法。 ４ 成形品の一部分を圧縮することを特徴とする
特許請求の範囲第１項記載の反応射出成形方法。 ５ 材料、硬質、半硬質及び軟質ポリウレタンな
ど反応硬化する材料であることを特徴とする特許
請求の範囲第１項記載の反応射出成形方法。[Claims] 1. Reaction injection molding characterized by compressing the material in the same mold at the initial stage of reaction hardening of the material injected into the mold, densifying the material structure and applying compressive stress. Method. 2. The reaction injection molding method according to claim 1, wherein the mold for compressing the material has a flat plate shape, and the material is compressed simultaneously using an upper flat plate and a lower flat plate. 3. The reaction injection molding method according to claim 1, wherein the material contacting surface of the mold for compressing the material is a curved surface, and the material is simultaneously compressed by an upper mold and a lower mold having curved surfaces. 4. The reaction injection molding method according to claim 1, wherein a part of the molded product is compressed. 5. The reaction injection molding method according to claim 1, wherein the material is a reaction-hardening material such as hard, semi-hard, and flexible polyurethane.
JP58192401A 1983-10-17 1983-10-17 Reaction injection molding Granted JPS6083820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58192401A JPS6083820A (en) 1983-10-17 1983-10-17 Reaction injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58192401A JPS6083820A (en) 1983-10-17 1983-10-17 Reaction injection molding

Publications (2)

Publication Number Publication Date
JPS6083820A JPS6083820A (en) 1985-05-13
JPH048207B2 true JPH048207B2 (en) 1992-02-14

Family

ID=16290695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58192401A Granted JPS6083820A (en) 1983-10-17 1983-10-17 Reaction injection molding

Country Status (1)

Country Link
JP (1) JPS6083820A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62220308A (en) * 1986-03-22 1987-09-28 Kawasaki Yukou Kk Reactive injection molding method
JPS62220307A (en) * 1986-03-22 1987-09-28 Kawasaki Yukou Kk Press molding method for low-viscosity reactive molding material
US5344600A (en) * 1989-06-07 1994-09-06 Motorola, Inc. Method for encapsulating semiconductor devices with package bodies
US5656234A (en) * 1994-08-12 1997-08-12 Mitsubishi Gas Chemical Company, Inc. Mold apparatus and injection molding method for producing hollow-structured article by injection molding
NL1027912C2 (en) * 2004-12-28 2006-07-03 Ecim Technologies Bv Mold and method for product formation.

Also Published As

Publication number Publication date
JPS6083820A (en) 1985-05-13

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